Owner's Manual DF25A, DF30A Propeller Selection And Installation

It is essential to use a propeller on your outboard motor that is properly matched to your boat’s operating characteristics. The speed of the engine when you operate your boat at full throttle depends on the propeller you use. Excessive engine speed can seriously damage the motor, while low engine speed at full throttle will adversely affect the performance. Your operating load will also affect propeller selection. Smaller loads generally require larger-pitch propellers; larger loads generally require smaller-pitch propellers. Your authorized Suzuki Marine Dealer will assist you in selecting a suit able propeller for your boat.

Installing a propeller with either too much or too little pitch will cause incorrect maximum engine speed, which may result in severe damage to the motor.
Ask your authorized Suzuki marine dealer to assist you in selecting a suitable propeller for your boat.

You can determine if your propeller is appropriate for use with your boat by using a tachometer to measure engine speed when operating your boat at full throttle, under minimum load conditions. If you are using an appropriate propeller, the engine speed will be within the following range:

If the engine speed is not within this range, consult your authorized Suzuki Marine Dealer to determine which propeller size is best for you.

If you change propellers, be sure to perform the above check again, to confirm that the engine speed under full throttle is within the specified range.

Failure to take proper precautions when installing or removing the propeller can result in severe personal injury.
When installing or removing the propeller:
• Always shift into “Neutral” and remove the emergency stop switch lock plate so that the motor cannot be started accidentally.
• Wear gloves to protect hands, and “lock” the propeller by placing a block of wood between the blades and the anti-cavitation plate.

To install a propeller on your outboard motor, use the following procedure:

1. Coat the propeller shaft splines (1) liberally with Suzuki water resistant grease to help prevent corrosion.
2. Place the stopper (2) on the shaft.
3. Align the propeller (3) with the propeller shaft splines and slide the propeller onto the shaft.
4. Place the spacer (4) and washer (5) on the shaft.
5. Install the propeller nut (6) and tighten it with a torque wrench to 20 – 30 N·m (2.0 – 3.0 kg-m/14.5 – 21.5 lb-ft).
6. Align the grooves in the propeller nut with the hole in the shaft, then insert the cotter pin (7) and bend the pin ends over to lock it in place.

To remove the propeller, reverse the above procedure.